Tiioksten nokdenfelt



(Nu Model.)

T. NORDENPBLT.

PROJBGTILB. No. 270,101. Patented Jan. 2, 1'883.

UNITED STATES PATENT, OFFICE.

'IIIORSTEN NOBDENFELT, OF WESTMINSTER, ENGLAND.

DROJ ECTILE.

SPECIFICATION forming part of Letters Patent No. 270,101, dated January2V, 1883.

Application filed September Il, lBPQ. (No model.) Patented in EnglandFebruary 23, 1852, No. S91. and in France May iti, IPFE,

N0. 149,00. Y l

To all whom it may concern:

Beit known that I, THoRsTEN Nonnnnret'r, a subject of the King ofSweden,residingat 53 Parliament Street, inthe city of Westminster, England,have invented acertain newand useful Improvement in Projectiles, (forwhich I have received Letters Patent in Great Britain, No. 891, dated23d February, 1882, and in France, No. 149,008, dated 16th May, 1852,)of which the following is a specification.

The object of my invention is toimprove projectiles of iron or steelsuchas are coated or covered with a solter metal-for'the following specialpurposes: first, to prevent by means ofthe softer metal the hardprojectile from dam aging or wearingout the grooves of the, riding;second, to use a projectilecloserup to thegage of the caliber ofa gunthan can bedone it'the hard metal is without such softer covering, astheprojectiles might stick in the bore and cause an explosion; third, toinsure better centering ofthe projectile in the bore, and consequently asteadier flight through the air, than cati be attained with the largerplay, which is necessary if theprojectileis not covered with softermetal; fourth, to give required rotation to the projectile by means ofthe softer-tnetal covering by letting it into the grooves of the riding.In order to do this, I make thc part or parts of the surface of theironor steel projectile which have to be coated with the softer metalsntliciently even or polished, and I clean theseparts by dipping theprojectile into acid. rI`hen l insert the projectile into a bath ofcopper or tin, and apply electricity from a galvanic battery or from anelectrical machine. By this means I cause copper or tin to be depositedou and to adhere to the surface of the projectile to the desiredthickness. 'lo cause the coating of copper or tin to give rotation tothe projectile, I make it thicker in one or more parts of the projectilethan in the other parts; or I put a. disk or one or more rings of copperor brass round the projectile of such a diameter as to tll up the borecompletely, and thenput on the coating over this disk or rings by meansofthe copper or tin bath. The coating put on in the copper or tin bathassists in fixing this disk or rings onto theprojectile. lfI wishtoputapartial coveringA only onto the projectile, I cover parts than inothersl putthe coating ou first of f therequired thickncssoverthewholeprojectile or over the parts which I wish to have thinly covered. 'IhenI ptit varnish over the parts I wish thinly covered, and put theprojectile again into the electrical bath and apply a thicker coveringtu the uitvarnished parts.

Iuorderthat my said invention may be most fully understood and readilycarried into effeet, I will proceed to describe the drawings hereuntoannexed.

In the drawings, Figure l is a longitudinal section ofau iron orsteelprojectile coatcdwith copper or soft metal in accordance with my invention. a is the body of the projectile. bis a cup ot' the sol'termetal deposited upon or applied to the base ofthe projectile. It isintended to take the rifing and impart rotation as the projectiletravclsalong the barrel. c is a covering ofthe solter metal appliedoverthe cup. lf it be desired to produce the cup b by deposition from ncoating-bath, the projectile, having been thoroughlycleaned, is immersedinthe coating-bath to the depth to which itis desired that the depositshould extend, the electrical connections are made, and the metaldeposited from the solution until itattainsthc requisite thickness;orthe surface maybe varnished. excepting those parts ou which the cup isto be produced, and then theprojectile may be more deeply immersed inthe coatingbatl|. When a cup of the desired thicknessis formed theprojectile is removed from the bath and the varnish is thoroughlycleaned oli` before the nextoperation or, in place ofproducing the cupbyelectrical deposition, a cup of the softer mctal,produced bycastingorstamping, may be forced onto the base end ofthe projectile. Thecup having been formed or applied, the outer covering, c, is thenproduced over it by electrical deposition, as already described in rcspect to the cn p b. Thecoveringcextendsovcr all the parts oftheprojectile which can come into Contact with the interior of the barrel.

Fig. 2 represents a section of a projectile in IOO which :ibase-cup isnot employed; butin place thereof there nre ring ot' the softer inetnlto luke the riding. d d are these rings. They indy be produced byelectric deposition, while the other parte ofthe surface ot' theprojectile ure covered with varnish; or they may berings cut from n tubeof the softer metal .1nd forced onto the body ot' the projectile. Theouter covering, c, is produced over the rings, as already described.

Fig. 3 is a. section of :i projectile similar to that shown by Fig. 2,but furnished both with base-cup and ring.

Fig. 4 is a Section of :t projectile which has lirst receiveda thincoatingot' the softer metal by electrical deposition snilicienttoprotect the projectile from rust, and which has then been provided withn base-cup1 b,and an outer covering, c, hy the means already described.

Having thus described the natureofiny said invention and the manner ofperforming the saine, I would haveit understood thatIelaim- A hard-metalprojectile provided with the soft-metal buse-cup or specitied equivalentthereof, and with the outer envelope or cover- 25 ing of soft metal, asund for the purpose described.

" THORSTEN NORDENFELT.

Witnesses:

G. W. WESTLEY, WALTER J AMES SKERTEN. Both of 17 Gracechurch Street,London.

